[PATCH 3/3] cxl/type3: Add 'dirty-shutdown' parameter

[Davidlohr Bueso <dave@stgolabs.net>]

Add a new parameter for type3 memory devices to set the
dirty shutdown count to a specified value. This allows
emulating failure paths and informing the admin of such
event via the Get Health Info command.

For example, upon a failed GPF, users can boot with
dirty-shutdown=1 and with the cleared shutdown state,
to emulate the hardware behavior.

root@cxl:~# cxl list -m mem1 -H
  {
    "memdev":"mem1",
    "pmem_size":2147483648,
    "health":{
      "maintenance_needed":false,
      "performance_degraded":false,
      "hw_replacement_needed":false,
      "media_normal":true,
      "media_not_ready":false,
      "media_persistence_lost":false,
      "media_data_lost":false,
      "media_powerloss_persistence_loss":false,
      "media_shutdown_persistence_loss":false,
      "media_persistence_loss_imminent":false,
      "media_powerloss_data_loss":false,
      "media_shutdown_data_loss":false,
      "media_data_loss_imminent":false,
      "ext_life_used":"normal",
      "ext_temperature":"normal",
      "ext_corrected_volatile":"normal",
      "ext_corrected_persistent":"normal",
      "life_used_percent":20,
      "temperature":30,
      "dirty_shutdowns":1,
      "volatile_errors":0,
      "pmem_errors":0
    },
    "serial":0,
    "host":"0000:0e:00.0"
  }

Signed-off-by: Davidlohr Bueso <dave@stgolabs.net>
---
 hw/cxl/cxl-mailbox-utils.c  | 32 ++++++++++++++++++++++++++++++++
 hw/mem/cxl_type3.c          |  1 +
 include/hw/cxl/cxl_device.h |  3 +++
 3 files changed, 36 insertions(+)

diff --git a/hw/cxl/cxl-mailbox-utils.c b/hw/cxl/cxl-mailbox-utils.c
index ff1d3f50610c..85a58ab96bef 100644
--- a/hw/cxl/cxl-mailbox-utils.c
+++ b/hw/cxl/cxl-mailbox-utils.c
@@ -87,6 +87,7 @@ enum {
         #define GET_LSA       0x2
         #define SET_LSA       0x3
     HEALTH_INFO_ALERTS = 0x42,
+        #define GET_HEALTH_INFO        0x0
         #define GET_SHUTDOWN_STATE     0x3
         #define SET_SHUTDOWN_STATE     0x4
     MEDIA_AND_POISON = 0x43,
@@ -1724,6 +1725,35 @@ static CXLRetCode cmd_sanitize_overwrite(const struct cxl_cmd *cmd,
     return CXL_MBOX_BG_STARTED;
 }
 
+/* CXL r3.2 Section 8.2.10.9.3.1: Get Shutdown State (Opcode 4200h) */
+static CXLRetCode cmd_health_get_health_info(const struct cxl_cmd *cmd,
+                                             uint8_t *payload_in,
+                                             size_t len_in,
+                                             uint8_t *payload_out,
+                                             size_t *len_out,
+                                             CXLCCI *cci)
+{
+    CXLType3Dev *ct3d = CXL_TYPE3(cci->d);
+    struct get_health_info_pl {
+        uint8_t health_status;
+        uint8_t media_status;
+        uint8_t additional_status;
+        uint8_t life_used;
+        uint16_t device_temperature;
+        uint32_t dirty_shutdown_count;
+        uint32_t corrected_volatile_error_count;
+        uint32_t corrected_persistent_error_count;
+    } QEMU_PACKED *out = (void *)payload_out;
+
+    /* anything not set explicitly is considered under normal health */
+    out->life_used = 20;
+    out->device_temperature = 30;
+    out->dirty_shutdown_count = ct3d->dirty_shutdown;
+    *len_out = sizeof(out);
+
+    return CXL_MBOX_SUCCESS;
+}
+
 /* CXL r3.2 Section 8.2.10.9.3.4: Get Shutdown State (Opcode 4203h) */
 static CXLRetCode cmd_health_get_shutdown_state(const struct cxl_cmd *cmd,
                                                 uint8_t *payload_in,
@@ -2911,6 +2941,8 @@ static const struct cxl_cmd cxl_cmd_set[256][256] = {
          CXL_MBOX_BACKGROUND_OPERATION_ABORT)},
     [PERSISTENT_MEM][GET_SECURITY_STATE] = { "GET_SECURITY_STATE",
         cmd_get_security_state, 0, 0 },
+    [HEALTH_INFO_ALERTS][GET_HEALTH_INFO] = { "HEALTH_INFO_ALERTS_GET_HEALTH_INFO",
+        cmd_health_get_health_info, 0, 0 },
     [HEALTH_INFO_ALERTS][GET_SHUTDOWN_STATE] = { "HEALTH_INFO_ALERTS_GET_SHUTDOWN_STATE",
         cmd_health_get_shutdown_state, 0, 0 },
     [HEALTH_INFO_ALERTS][SET_SHUTDOWN_STATE] = { "HEALTH_INFO_ALERTS_SET_SHUTDOWN_STATE",
diff --git a/hw/mem/cxl_type3.c b/hw/mem/cxl_type3.c
index 5f365afb4dd1..e622eb9101ce 100644
--- a/hw/mem/cxl_type3.c
+++ b/hw/mem/cxl_type3.c
@@ -1380,6 +1380,7 @@ static Property ct3_props[] = {
                      TYPE_MEMORY_BACKEND, HostMemoryBackend *),
     DEFINE_PROP_LINK("lsa", CXLType3Dev, lsa, TYPE_MEMORY_BACKEND,
                      HostMemoryBackend *),
+    DEFINE_PROP_UINT32("dirty-shutdown", CXLType3Dev, dirty_shutdown, 0),
     DEFINE_PROP_UINT64("sn", CXLType3Dev, sn, UI64_NULL),
     DEFINE_PROP_STRING("cdat", CXLType3Dev, cxl_cstate.cdat.filename),
     DEFINE_PROP_UINT8("num-dc-regions", CXLType3Dev, dc.num_regions, 0),
diff --git a/include/hw/cxl/cxl_device.h b/include/hw/cxl/cxl_device.h
index 69e6330fe66d..f756e1a99f33 100644
--- a/include/hw/cxl/cxl_device.h
+++ b/include/hw/cxl/cxl_device.h
@@ -653,6 +653,9 @@ struct CXLType3Dev {
         uint8_t num_regions; /* 0-8 regions */
         CXLDCRegion regions[DCD_MAX_NUM_REGION];
     } dc;
+
+    /* Dirty shutdown count */
+    uint32_t dirty_shutdown;
 };
 
 #define TYPE_CXL_TYPE3 "cxl-type3"
-- 
2.39.5